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Fig. 3


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Table of magnetic and electrical observations of 4 and 5 February 1872 carried out in the laboratories of the Roman College. The different columns record: the date and time (Rome solar time), the magnetic declination, the electric current measured by a galvanometer, the variations of the horizontal and vertical components of the magnetic field (and relative instrument temperatures), sky coverage and general notes, electrical measurements. From the note Memoria sull’Aurora Elettrica del 4 Febbraio 1872 (Secchi, 1872).

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